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use master
exec sp_helptext sp_MSforeachtable
exec sp_helptext sp_Msforeachdb
sp_MSforeachtableϵͳ´æ´¢¹ý³ÌÓÐ7¸ö²ÎÊý£¬½âÊÍÈçÏ£º
@command1 nvarchar£¨2000£©, --µÚÒ»ÌõÔËÐеÄT-SQLÖ¸Áî
@replacechar nchar£¨1£© = N'?', --Ö¸¶¨µÄռλ·ûºÅ
@command2 nvarchar£¨2000£©= null,--µÚ¶þÌõÔËÐеÄT-SQLÖ¸Áî
@command3 nvarchar£¨2000£©= null, --µÚÈýÌõÔËÐеÄT-SQLÖ¸Áî
@whereand nvarchar£¨2000£©= null, --¿ÉÑ¡Ìõ¼þÀ´Ñ¡Ôñ±í
@precommand nvarchar£¨2000£©= null, --ÔÚ±íǰִÐеÄÖ¸Áî
@postcommand nvarchar£¨2000£©= null --ÔÚ±íºóÖ´ÐеÄÖ¸Áî
sp_MSforeachdb³ýÁË@whereandÍ⣬ºÍsp_MSforeachtableµÄ²ÎÊýÊÇÒ»ÑùµÄ¡£
--ÎÒÃÇÀ´¿´¿´sp_MSforeachtableµÄÓ÷¨£¨sp_MSforeachdbµÄÓ÷¨ÀàËÆ£©£º
--ͳ¼ÆÊý¾Ý¿âÀïÿ¸ö±íµÄÏêϸÇé¿ö£º
exec sp_MSforeachtable @command1="sp_spaceused '?'"
--¼ì²éÊý¾Ý¿âÀïÿ¸ö±í»òË÷ÒýÊÓͼµÄÊý¾Ý¡¢Ë÷Òý¼°text¡¢ntext ºÍimage Ò³µÄÍêÕûÐÔ
--ÏÂÁÐÓï¾äÐèÔÚµ¥Óû§Ä£Ê½ÏÂÖ´ÐУ¨sp_dboption 'db_name', 'single user', 'true'£©,½«true¸Ä³Éfalse¾ÍÓÖ±ä³É¶àÓû§ÁË
exec sp_msforeachtable "dbcc checktable('?',repair_rebuild)"


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when 1 then 'red'
when 2 then 'green'
when 3 then 'blue'
else 'black'
end as 'colorName',
foodName from foods
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